Process of making anhydrous zinc chlorid.



UNITED STATES PATENT OFFICE- OSCAR JULIAN S TEINIlAR'I, 'JuLms LEONARDFOX VOGEL, 'ANID HENRY ERNEST OF LONDON, ENGLAND; SAID STEINI-IART ANDVOGEL ASSIGNORS T SAID FRY.

PROCESS'OF MAKING ANHQYDRQ US-ZI NC CHLORID.'-

SPECIFICATION forming part of Letters Patent No. 648,809, dated May 1,1900. Application filed April 10, 1899. Serial No. 712,511. onspecimens.)

To all whom it may concern.-

Be it known that we, OSCAR JULIAN STEIN- HART and JULIUS LEONARD FoxVOGEL, electrochemists, residing at 91 Blackfriars road, London, in thecounty of Surrey, and HENRY ERNEST FRY, mineral merchant, residingatLaurence Pountney Hill, London, England,

subjects of the Queen of Great Britain, have invented a certain new anduseful Process for tion of hydrochloric acid,'and although the thesolution of zinc-chlorid if .1 :o a suitable airtight vessel and thenheat the vessel exterin a fused state.

heatingis continued for a long period it is impossible owing to thehygroscopic nature of, the salt to get'rid of the last three-or four percent. ofwater, although hydrochloric acid,

continues to be given off by the decomposition of the water, with theaccompanying formationol oxychioridof zinc. 4 v

The obj ect-of this invention is to dehydrate zinc chlorid moreefiectually than has hitherto been possible and atthe same time to avoidthe'loss of chlorin and simultaneous f orma-, v

' drous zinc chlorid remains in a fused state tion 'of zinc oxychloridhAccording to our invention we introduce nally to boil the solution anddrive'ofi watervapor from it, jwhile at the same time we maintain in thevessel a partial vacuum, until all the moisture has been driven off andanhydrouszinc chlorid remains in the vessel As an alternative the firstportion of the concentrating process'might be conducted in the ordinaryWay until such a.

degree of concentration has beenattained that the zinc chlorid'wouldsoon commence to decompose and afterward the process might be completedunder reduced pressure. In either case air from which all moisture hasbeen previously extracted may be drawn either over or through the zincchlorid to assist' in carrying off all water-vapor. -Irefer ably weintroduce the previously-dried i below the surface of the molten chloridthrough a pipe extending downward from the upper part of the vessel. 7

By effecting'or completing the dehydration of zinc chlorid under areduced pressure in the above Way we are enabled toobtain a nearly-puredehydrated zinc chlorid containing only a slight trace of zinc oxid andless than onehalf per cent. of water, whereas when the concentration iseffected in the open air the percentage of water contained vin the zincchlorid can never,-be reduced be-.

low from three and one-half to fourper cent.,

and when the percentage of water has been taining a vacuum therein untilthe solution v is boiled, watery vapor'driven off and anhy-.-

with only a trace of zinc oxid.

3. The process herein described of manufacturiug'dehydrated zincchlorid,"which con sists in boiling a solution of zinc chloridin avessel inwhich a partial vacuum is maintained, and at the same time.passinga current of previously-dried air over or through the moltenchlorid, v

oscna JULIAN 'STEINHART. JULIUS LEONARD-FOX VOGEL.

HENRY ERNEST FRY.

Witnesses to the signatures of Oscar Julian Steinhart and Julius-Leonard FoxVogelz "Fry:

FRED O. HARRIS, GEo. J B. FRANKLIN, Witnesses to the signature of HenryErnest HENRY BLANCHARD STUNT, G,.,F. WARREN. I

